Is LAN Switching Capacity on Router Specs Seperate from Throughput

I need some info to finish mapping out my Peplink network upgrade/overhaul.

Peplink Balance data sheets only list Routing Throughput and I can’t find any info on Switch Capacity specs.

By example: The current Balance 310 has Routing Throughput of 4Gbps and also has four 10G LAN ports. Is data traveling from LAN port 1 to LAN port 2 capped by the 4Gbps Routing ‘bus’ or can LAN packets saturate the 10G ports?